1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3b69ee40e45ac04ce79eb4fd13f7b41a8524ce81707b2c869c6987df5a6d1c. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c9802fc-abdf-4255-8624-aedd297f13a3.json and https://artists.proofprofile.net/proofs/artist/3c9802fc-abdf-4255-8624-aedd297f13a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaca8d7587b7577cb4eb52249f47548f2e847988dab3b75484b4e2a594cde6a9. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZAPG1776848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b615c7b9b34574eb7a069fe9e5b37eaf2de6f2729daa894f2671e7e21f5b4c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES81923768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2b5fab5b6537967765782af167197c3005bdb8e566a67a01eea00a19f74191. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USDM32029704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc3edb089056c11ad3d9532912442986f3c9f782d17b67ee81f34f738f6754c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY1981071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x757b12a11feaee89ea4f8366e11c985e9f698e14333274f2f27f30c7d7cb4415. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHCR2100051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c374126a62b228111ae69b5792b34ffc82e878b897746331bb5e7b668448d5a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAUM82000076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d67465fb82811cf637373c384bfa099eba9131ecda44eb6c96b9925d1f88f3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRD51831623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ee9e540119bf7009ba26f2d4ac8085f8f2c07de7675a4177ac16879d90e548. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRD51831624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48380bf1ac3c8872d655394b27987bc705b4ba562a65a163113529f1b467822. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6M2020735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a350b454be95c92951192585fdd05a4280cd0af227808b3e7109f06d9abea6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2201218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db96ed7b9feda029e237f2541f05944a6a075c76dfe478e34c4d6e9ee3f7db7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA6D21700309.
Doki Doki Literature Club Plus! (Original Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefda159e60f9e9bbd91b924c108cc1789a079c6cba94f10486e61c086fff6d7a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2196106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab39a701b666d0d0afaa8d2bdc66a4f17e135890b5c2b2e3113d3dd01ffb4ca. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGL2210625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9cfad502bba09c13c2e0f98a0e9344ae14c7b4700eb7e0a115a44581b3a9b9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGL2210669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511cd7b6dc716890cccc321d54670bb5997b985c5428dd5c04440e5edad4de34. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGL2210792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8385c0336142e38c96dd2c65362474229af54b29590924771762ed8819248219. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGL2211231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4133a6df45dc7b6074d1af994676d988ddc43d13e9380c2118bb84cd652157c8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAGOO2006319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4cb4cab7a331b902e8db732e22a33e4393546f128bdfec686d2892357853b77. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM42K1949364.